Reverse motion preventer for



Sfiptu 1936. J CILLEY 2,053,25U

REVERSE MOTION PREVENTER FOR KNITTING MACHINES Filed Dec. 5, 1955 5 Shee'tsSheet 1 a Q I JOSEPH E. CILLEY' S p 1936- J. E. CILLEY REVERSE MOTION PREVENTER FOR KNITTING MACHINES Filed'Dec. 5, 1935 3 Sheets-Sheet 2 gwum vfoz JosEPH ECILLEY J. E. CILLEY Sept. 8, 1936.

REVERSE MOTION PREVENTER FOR KNITTING MACHINES I 5 Sheets-Sheet 3 Filed Dec. 5, 1955 Patented Sept. 1936 UNITED STATES.

' PATENT OFFICE REVERSE MOTION PREVENTER FOB.

KNITTING MACHINES This invention relates to a control mechanism for full-fashioned knitting machines and more especially to an automatic brake which instantly arrests the machine to prevent any reverse motion of the shafts therein after the power has been cut off. If the machine revolves backwardly after it has been stopped the yarn carrier will also go backwards and frequently the needles will be broken and also a defective fabric will result.

Since there are numerous cams on the cam shaft of a full-fashioned knitting machine and since these cams have spring pressed rollers contacting the same it frequently occurs that the machine isstopped while one or more of the rollers are passing from the low side to the high side of the cams. As a result the machine will have -a pronounced tendency to revolve backwardly especially if the rollers have not quite reached the high side of the cam when the inertia has been expended.

It is, therefore, anobject of this invention to provide a brake or stop motion secured to one of the shafts in the machine such as the hand wheel shaft of a full-fashioned knitting machine which will allow rotation in a positive direction but immediately upon any reverse motion the brake will be automatically applied.

It is another object of this invention to provide a brake mechanism on one of the shafts of a fullfashioned hosiery machine having means thereon for manually releasing the brake mechanism to allow the operator to revolve the hand wheel shaft.

backwards manually when it is so desired.

It is a further object of this invention to provide a brake mechanism for a full-fashioned hosiery machine comprising a brake drum having a pair of segmental arcuate brake shoes thereon pivotally secured to each other, one of said shoes normally loosely contacting said drum at all points, the other of said arcuate shoes normally contacting the surface of said drum at one end only and an off-center pivoted means pivoted to both of said shoes and to the frame of the knitting machine for automatically causing all of the surfaces of said shoes to engage the drum upon reverse rotation of the hand wheel shaft. 7 Some of the objects of the invention having been stated, other objects will appear as the description proceeds when taken in connection with the accompanying drawings, in which:-

Figure l is a sectional plan view of the lower portion of a section of a full-fashioned knitting machine showing the invention applied thereto;

Figure 2 is a vertical sectional view taken along line 2-2 in Figure 1;

Figure 3 is an elevation looking at the lefthand side of Figure 2;

Figure 4 is a vertical sectional view taken along line 44 in Figure 3 and showing the brake shoes in an operative position when the hand wheel 5 shaft starts to revolve backwardly;

Figure 5 is a sectional view similar to Figure 4 but showing the brake shoes in a released position which will allow the operator to manually turn the shaft reversely with the hand wheel;

Figure 6 is a sectional view taken along line t6 in Figure 2.

Referring more specifically to the drawings, the numerals I 0 and H denote suitable machine frames for one section or head of a full-fashioned 15 knitting machine in which a stocking leg or foot is knitted at each of the sections or heads of the machine. The machine in. some instances includes sections up to possibly twenty-four, but only one is shown to show the application of the invention. The main drive l2 shaft extends the length of full-fashioned knitting machine and is rotatably mounted in the frames I0 and H and similar frames throughout the length of the machine. This shaft has a sprocket i3 fixedly secured thereon upon which is mounted a sprocket gear belt It, said belt being also mounted upon another gear sprocket l5 of motor 16. The main drive shaft I2 also has fixedly mounted thereon a sprocket gear H, which in turn, has a sprocket 30 gear belt i8 mounted thereon. This belt [8 is also mounted on a sprocket gear l9 which is fixedly secured on hand wheel shaft 20 and the shaft 20 is rotatably mounted in brackets 2| and 22 secured to machine frames 10 and II respectively.

The hand drive consists of the usual hand wheels 24 and 25 disposed at various points along the machine front on the hand wheel shaft 20, there being one of these hand wheels for each head or section so that the operator may turn any one of these wheels to operate the shaft and cause the machine to be operated at a slow speed.

The parts thus far described are conventional but it is deemed necessary to disclose this much of the old structure to more fully set forth the function of the invention.

Inorder to prevent reverse rotation of the shaft 20 and the associated shafts, after the power has been cut off and the forward speed has ceased, a brake drum 3!] has been provided which comprises semi-circular segments I 3| and 32. These segments have suitable lugs extending from the hub portion thereof which are penetrated by stud bolts 33 and 34 to hold the segments together and to secure the segments to the shaft 20 after it has been placed around the hand wheel shaft 20. An additional set screw 35 is provided which normally engages the shaft 20 to prevent relative rotation between the shaft and the drum 30 whichcomprises the semi-circular segments 3| and 32.

Normally engaging the periphery of the drum 30 is a metal brake band 36 having friction lining 31 secured thereto by any suitable means such as rivets 38. One end of the metal band 36 is pivoted as at 39 to lever arm 40, said arm 40 having a slot 4| in the lower end thereof which is slidably mounted over stud 42 projecting out from the lower side of bracket 22.

The upper end of lever 40 is pivoted as at 43 to metal band 44 which has secured to the inner surface thereof a friction lining 45 by any suitable means such as rivets 46. The upper end of band 44 has a ing 48 projecting therefrom which is penetrated by a bolt 49 having nuts 5!] threadably secured on the end thereof to hold the bolt 49 in position within the lug 48. The upper end of bolt 49 is bifurcated and is pivoted as at 5| to lever 52, said lever 52 being pivoted as at 53 to lug 54 extending from one end of band 46. A tension spring 56 has one end thereof secured to hook 51, which hook is threadably mounted in lug 58 extending from band 44. The other end of the spring is secured as at 59 to lever 40. This spring 56 normally tends to rotate the lever 40 in a counter-clockwise manner about stud 42 to hold the shoe which comprises band 44 and lining 45 in the position shown in Figure 2. It will be noted in this figure that the lining 45 only engages the periphery of the drum at one point, namely, at point 60. At the lower edge of the lining, that is; at point 6|, there is a substantial clearance between the periphery of the drum and the lining 45.

As long as the shaft 20 and its associated parts continue to rotate in a clockwise manner in Figure 2, the parts will remain in substantially the same position as shown in this Figure, and the lining 31 will loosely contact the periphery of the drum but will not apply any appreciable friction thereto. If, after the machine has been stopped, the shaft 20 should start to move backwardly or in a counter-clockwise manner, in Figure 2, the shoe which comprises metal band 44 and lining 45 will immediately come into action since the reverse movement of the shaft will cause the lining 45 at point 6| to frictionally grip the periphery of the drum and rotate the lever 40 in a clockwise manner about the stud 42. When this is done all portions of the lining will immediately contact the periphery of the drum in a manner shown in Figure 4.

Rotation of the shaft 20 in a clockwise direction in Figure 2 will cause the slight friction between band 31 and the drum 3!] to move lever 40 in a counter-clockwise direction in Figure 2 against the tension of spring 56 to hold the parts in the position shown in Figure 2, and when the shaft 20 stops, the band 31 will creep on the drum 30 on account of tension of spring 56 and the parts will assume the position shown in Figure 4, Now, when the shaft 20 starts to rotate backwardly the joint forces exerted on lever 40 by the bands will tighten the bands and reverse rotation of the shaft is prevented.

In addition to the lining 45 contacting the periphery, the lining 31 will also be drawn in closer contact to the periphery and more pressure applied; consequently, the friction from this source will be increased due to the fact that the clockwise rotation of lever 40 will cause the pivot points 39 and 43 to be moved unequal amounts to cause both of said bands to tightly engage the periphery of the drum. If for any reason the operator should desire to turn the shaft 20 backwardly, then the lever 52 will be rotated in a counter-clockwise manner to a position shown in Figure 5 which will permit reverse rotation of the shaft.

It is thus seen that I have provided a simple brake mechanism for preventing any oscillation of the hand wheel shaft, but instead, will allow only positive rotation of the same.

In the drawings and specification there has been set forth a preferred embodiment of the invention, and although specific terms are used, they are used in a generic and descriptive sense only, and not for purposes of limitation, the scope of the invention being set forth in the appended claims.

I claim:

1. Apparatus for preventing reverse motion in the shafts of a full-fashioned knitting machine comprising a brake drum secured on one of the shafts of the knitting machine, a pair of segmental brake bands secured together at one of their ends, a lever having one of its ends pivotally and slidably mounted on the framework of the machine, means for pivotally securing the other end of one of said brake bands to the other end of said lever, means for securing the other end of the other of said brake bands to an intermediate portion of said lever whereby rotation of the shafts in one direction will move the brake bands from gripping contact wth the drum, while reverse motion in the shafts will move the lever in the other direction and apply pressure from said bands onto the drum to prevent rotation of the shafts in a reverse direction.

2. Apparatus for preventing reverse rotation to the hand wheel shaft in a full-fashioned knitting machine comprising a drum secured on said shaft, a pair of segmental brake bands secured together at a proximate pair of ends by a toggle joint mechanism, a pivoted lever mounted on the machine and to which the other proximate pair of ends are pivotally secured in off-set relation so the bands will lightly engage the drum and whereby rotation of the shaft in one direction will tend to move the bands away from the drum but rotation of the shaft in the other direction will move the lever and the cause the bands to grip the drum and prevent rotation of the shaft in the other direction.

3. Apparatus for preventing reverse rotation of a full-fashioned knitting machine havinga hand wheel shaft, a brake drum secured on said shaft, a member having a slot in one end thereof, a pin secured on the machine and penetrating said slot, a segmental brake band pivotally secured at one of its ends to the other end of said slotted member, a second segmental brake band secured at one of its ends to an intermediate portion of said slotted member at a point between said slot and the point where the other brake band is secured to the member having the slot therein, means for securing the other ends of said segmental brake bands together to cause them to fit said drum closely but to apply no appreciable gripping action thereto while the shaft is rotating in one direction, but reverse motion of the said shaft causing the brake bands to grip the drum and prevent reverse motion of said shaft.

4. Apparatus for'preventing rotation of a drive shaft in a full-fashioned knitting machine comprising a drum secured on said shaft, a pair of brake bands encircling said drum, a toggle-joint mechanism connecting a pair of proximate ends of said hands, a lever to which the other pair of proximate ends of said bands are connected in off-set relation, the bands being secured together at their ends so as to slightly engage the drum and oifer no apprecible resistance to rotation of the shaft in one direction, but reverse rotation of the shaft moving said bands and said lever to cause the bands to tightly grip the drum to prevent reverse rotation thereof.

5. Automatic braking means for preventing reverse rotationof a shaft rotatably mounted in a framework, comprising a brake drum secured on said shaft, a brake band encircling said drum, a member slidably and rotatably mounted on said framework, said brake band having its ends pivotally secured to said member at separated points whereby rotation of the drum in one direction will tend to move said member and the ends of" said band away from the drum but reverse rotation will cause the member and the ends of the band to move toward the drum and grip the same.

6. Automatic braking means for preventing re- 5 band, said second brake band being substantially 15 shorter in length than said first brake band and also having one end thereof normally engaging said drum and the other portions thereof slidably removed therefrom: whereby rotation of the drum in one direction will tend to move said 20 member and the pivoted ends of said bands away from the drum but reverse rotation will move the member and pivoted ends towards the drum to grip the same.

JOSEPH E. CILLEY. 25 

